WO2012108720A2 - Procédé et dispositif de transmission d'une confirmation de réception dans un système de communication sans fil - Google Patents

Procédé et dispositif de transmission d'une confirmation de réception dans un système de communication sans fil Download PDF

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Publication number
WO2012108720A2
WO2012108720A2 PCT/KR2012/001005 KR2012001005W WO2012108720A2 WO 2012108720 A2 WO2012108720 A2 WO 2012108720A2 KR 2012001005 W KR2012001005 W KR 2012001005W WO 2012108720 A2 WO2012108720 A2 WO 2012108720A2
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Prior art keywords
subframe
subframes
ack
nack
downlink
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PCT/KR2012/001005
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English (en)
Korean (ko)
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WO2012108720A3 (fr
Inventor
서동연
안준기
양석철
김민규
Original Assignee
엘지전자 주식회사
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Priority to US13/984,752 priority Critical patent/US9363687B2/en
Priority to CN201280008636.XA priority patent/CN103404063B/zh
Priority to KR1020137020912A priority patent/KR101530800B1/ko
Publication of WO2012108720A2 publication Critical patent/WO2012108720A2/fr
Publication of WO2012108720A3 publication Critical patent/WO2012108720A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
    • H04J11/0079—Acquisition of downlink reference signals, e.g. detection of cell-ID
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1864—ARQ related signaling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L2001/125—Arrangements for preventing errors in the return channel

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method and apparatus for transmitting ACK / NACK indicating an acknowledgment in a wireless communication system supporting carrier aggregation.
  • MIMO Multiple Input Multiple Output
  • CoMP Cooperative Multiple Point Transmission
  • relay the most basic and stable solution is to increase the bandwidth.
  • CA Carrier aggregation
  • one or more component carriers are aggregated to support broadband. For example, if one component carrier corresponds to a bandwidth of 5 MHz, four carriers are aggregated to support a bandwidth of up to 20 MHz. Such a system supporting carrier aggregation is called a carrier aggregation system.
  • all carriers use the same type of frame. That is, all carriers used a frequency division duplex (FDD) frame or a time division duplex (TDD) frame.
  • FDD frequency division duplex
  • TDD time division duplex
  • it is also considered to use a different type of frame for each carrier.
  • some of the carrier groups constituting the carrier aggregation system are considered to use a TDD frame but different UL-DL configuration.
  • a hybrid automatic repeat request that receives acknowledgment information about transmitted data, that is, an acknowledgment / not-acknowledgement (ACK / NACK) and transmits retransmission data when an error occurs in the transmitted data.
  • a receiver may perform decoding by combining data originally transmitted by a transmitter and data that is retransmitted.
  • the present invention provides a method and apparatus for transmitting ACK / NACK in a carrier aggregation system.
  • a method for transmitting an acknowledgment / not-acknowledgement (ACK / NACK) of a terminal in a wireless communication system includes receiving uplink-downlink (UL-DL) configuration information for a plurality of subframes ; Receiving data in at least one subframe of the plurality of subframes; Configuring an ACK / NACK for the received data; And transmitting the ACK / NACK through an uplink subframe, wherein the plurality of subframes correspond to the uplink subframe, and the plurality of subframes are fixed to downlink subframes, respectively.
  • UL-DL uplink-downlink
  • ACK / NACK payload size indicating the information bit size of the ACK / NACK is the number of default downlink subframes, the number of flexible subframes and the plurality of subframes among the plurality of subframes. And is determined based on the transmission mode of the frames.
  • the ACK / NACK payload size is a value obtained by multiplying the total number of flexible subframes included in the plurality of subframes by the number of default downlink subframes and the number of maximum transmittable codewords in each subframe. It may be the same number of bits.
  • the ACK / NACK payload size is obtained by adding the number of subframes recognized by the UE as a downlink subframe and the number of default downlink subframes among the flexible subframes included in the plurality of subframes.
  • the number of bits equal to a value obtained by multiplying the maximum number of codewords that can be transmitted in a frame.
  • the ACK / NACK payload size is a value obtained by multiplying the total number of flexible subframes included in the plurality of subframes by the number of maximum transmittable codewords in the flexible subframe and the plurality of subframes.
  • the number of bits equal to the sum of the number of default downlink subframes and the number of maximum transmittable codewords in the default downlink subframe may be added.
  • the plurality of subframes and the uplink subframe may be subframes of a primary cell.
  • the plurality of subframes may be subframes of a secondary cell, and the uplink subframe may be a subframe of a primary cell.
  • At least one subframe of the plurality of subframes may be a subframe of the primary cell, and the remaining subframes may be subframes of the secondary cell.
  • Uplink-downlink (UL-DL) configuration information for the plurality of subframes may be received through a primary cell.
  • the ACK / NACK may be transmitted using a physical uplink control channel (PUCCH) format 1a or 1b.
  • PUCCH physical uplink control channel
  • a physical uplink (PUCCH) control channel may transmit the ACK / NACK using format 1a or 1b.
  • a physical uplink control channel (PUCCH) format In case of receiving only a PDCCH requesting an ACK / NACK response only in one default downlink subframe among the plurality of subframes, and having a downlink assignment index (DAI) included in the PDCCH, 1, a physical uplink control channel (PUCCH) format
  • the ACK / NACK may be transmitted using 1a or 1b.
  • the primary cell may use a frequency division duplex (FDD) frame in which downlink transmission and uplink transmission are performed in different frequency bands.
  • FDD frequency division duplex
  • the secondary cells may use a TDD frame in which downlink transmission and uplink transmission are performed at the same frequency band and at different times.
  • the uplink-downlink (UL-DL) configuration information may be transmitted through a PDCCH for scheduling the first subframes.
  • the first subframes and the second subframes may be spaced apart by four subframes.
  • a terminal includes a radio frequency (RF) unit for transmitting and receiving a radio signal; And a processor connected to the RF unit, wherein the processor receives uplink-downlink (UL-DL) configuration information for a plurality of subframes, and includes at least one subframe among the plurality of subframes.
  • RF radio frequency
  • UL-DL uplink-downlink
  • Receive data configure ACK / NACK for the received data, and transmit the ACK / NACK through an uplink subframe, wherein the plurality of subframes correspond to the uplink subframe;
  • Each of the subframes may be any one of a default downlink subframe and a fixed subframe fixed as a downlink subframe, and the flexible subframe may be configured by the UL-DL configuration information.
  • the NACK payload size is determined based on the number of default downlink subframes, the number of flexible subframes, and the transmission mode of the plurality of subframes among the plurality of subframes.
  • ACK / NACK may be transmitted robustly to a PDCCH reception error.
  • 1 shows a wireless communication system.
  • FIG. 2 shows a radio frame structure used for FDD.
  • 3 shows a structure of a radio frame used for TDD.
  • FIG. 5 shows an example of a downlink subframe structure.
  • FIG. 6 shows a structure of an uplink subframe.
  • FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • FIG. 9 illustrates a subframe structure for cross carrier scheduling in a carrier aggregation system.
  • FIG. 10 illustrates a scheduling method between a base station and a terminal according to an embodiment of the present invention.
  • 11 shows an example of an unused subframe.
  • FIG. 12 shows an example of performing UL-DL configuration of a secondary cell on a subframe basis.
  • FIG 13 shows an ACK / NACK transmission method according to an embodiment of the present invention.
  • FIG 17 illustrates an example in which the first embodiment or the second embodiment is applied when only one serving cell is configured for the terminal.
  • FIG. 18 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • E-UMTS Evolved-UMTS
  • E-UTRAN Evolved-Universal Terrestrial Radio Access Network
  • SCD Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • LTE-A Advanced is the evolution of LTE.
  • 3GPP LTE / LTE-A is mainly described, but the technical spirit of the present invention is not limited thereto.
  • 1 shows a wireless communication system.
  • the wireless communication system 10 includes at least one base station 11 (BS). Each base station 11 provides a communication service for a specific geographic area. The geographic area can be further divided into a plurality of sub areas 15a, 15b, and 15c, each of which is called a sector.
  • the base station 11 generally refers to a fixed station communicating with the terminal 13, and includes an evolved NodeB (eNB), a Base Transceiver System (BTS), an Access Point, an Access Network (AN), and the like. It may be called in other terms.
  • eNB evolved NodeB
  • BTS Base Transceiver System
  • AN Access Network
  • the terminal 12 may be fixed or mobile, and may include a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), It may be called other terms such as a wireless modem, a handheld device, and an access terminal (AT).
  • MS mobile station
  • UT user terminal
  • SS subscriber station
  • PDA personal digital assistant
  • AT access terminal
  • downlink means communication from the base station 11 to the terminal 12
  • uplink means communication from the terminal 12 to the base station 11.
  • the wireless communication system 10 may be a system supporting bidirectional communication. Bidirectional communication may be performed using a time division duplex (TDD) mode, a frequency division duplex (FDD) mode, or the like. TDD mode uses different time resources in uplink transmission and downlink transmission. The FDD mode uses different frequency resources in uplink transmission and downlink transmission.
  • TDD mode uses different time resources in uplink transmission and downlink transmission.
  • FDD mode uses different frequency resources in uplink transmission and downlink transmission.
  • the base station 11 and the terminal 12 may communicate with each other using a radio resource called a radio frame.
  • FIG. 2 shows a radio frame structure used for FDD.
  • a radio frame used for FDD (hereinafter referred to as an FDD frame) is composed of 10 subframes in the time domain, and one subframe is composed of two slots in the time domain.
  • One subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI may be a minimum unit of scheduling.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain. Since 3GPP LTE uses OFDMA in downlink, one symbol period is represented by an OFDM symbol. The OFDM symbol may be called a different name according to the multiple access scheme. For example, when SC-FDMA is used as an uplink multiple access scheme, it may be referred to as an SC-FDMA symbol. An example of including 7 OFDM symbols in one slot is described as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • one subframe includes 7 OFDM symbols in a normal CP and one subframe includes 6 OFDM symbols in an extended CP.
  • the structure of the radio frame is only an example, and the number of subframes included in the radio frame and the number of slots included in the subframe may be variously changed.
  • 3 shows a structure of a radio frame used for TDD.
  • a radio frame used for TDD (hereinafter, referred to as a TDD frame) includes 10 subframes indexed from 0 to 9.
  • One subframe includes two consecutive slots.
  • one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • One slot may include a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain.
  • OFDM orthogonal frequency division multiplexing
  • One slot includes 7 OFDM symbols as an example, but the number of OFDM symbols included in one slot may vary according to the length of a cyclic prefix (CP).
  • CP cyclic prefix
  • one slot in a normal CP includes 7 OFDM symbols
  • one slot in an extended CP includes 6 OFDM symbols.
  • the subframe with index # 1 and index # 6 may be a special subframe, and the special subframe may include downlink pilot time slot (DwPTS), guard period (GP), and uplink pilot time slot (UpPTS). Include. DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • the following table shows an example of configuring a special subframe.
  • T s 1 / (30720) ms.
  • DL subframe In TDD, a downlink (DL) subframe and an uplink (UL) subframe coexist in one radio frame.
  • Table 2 shows an example of UL-DL configuration of a radio frame.
  • 'D' represents a downlink subframe
  • 'U' represents an uplink subframe
  • 'S' represents a special subframe.
  • the downlink slot includes a plurality of OFDM symbols in the time domain and includes N RB resource blocks (RBs) in the frequency domain.
  • the RB includes one slot in the time domain and a plurality of consecutive subcarriers in the frequency domain in resource allocation units.
  • the number N RB of resource blocks included in the downlink slot depends on a downlink transmission bandwidth set in a cell.
  • N RB may be any one of 6 to 110.
  • the structure of the uplink slot may also be the same as that of the downlink slot.
  • Each element on the resource grid is called a resource element (RE).
  • one resource block includes 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain to include 7 ⁇ 12 resource elements, but the number of OFDM symbols and the number of subcarriers in the resource block is exemplarily described. It is not limited to this. The number of OFDM symbols and the number of subcarriers can be variously changed according to the length of the CP, frequency spacing, and the like. The number of subcarriers in one OFDM symbol may be selected and used among 128, 256, 512, 1024, 1536 and 2048.
  • FIG. 5 shows an example of a downlink subframe structure.
  • the subframe includes two consecutive slots. Up to three OFDM symbols of the first slot in the downlink subframe are the control region to which the control channel is allocated, and the remaining OFDM symbols are the data region to which the data channel is allocated.
  • the control region includes 3 OFDM symbols.
  • control channels such as a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), and a physical hybrid ARQ indicator channel (PHICH) may be allocated.
  • the UE may read data transmitted through the data channel by decoding control information transmitted through the PDCCH.
  • the PDCCH will be described later in detail.
  • the number of OFDM symbols included in the control region in the subframe can be known through the PCFICH.
  • the PHICH carries a hybrid automatic repeat request (HARQ) acknowledgment (ACK) / NOT-acknowledgement (NACK) signal in response to uplink transmission.
  • HARQ hybrid automatic repeat request
  • ACK acknowledgment
  • NACK NOT-acknowledgement
  • a physical downlink shared channel (PDSCH) may be allocated to the data region.
  • the control region is composed of logical CCE columns that are a plurality of CCEs.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the CCE may correspond to 9 resource element groups.
  • Resource element groups are used to define the mapping of control channels to resource elements.
  • one resource element group may consist of four resource elements.
  • the CCE column is a collection of all CCEs constituting the control region in one subframe.
  • a plurality of PDCCHs may be transmitted in the control region.
  • the PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs).
  • CCEs control channel elements
  • the format of the PDCCH and the number of bits of the PDCCH are determined according to the number of CCEs constituting the CCE group.
  • the number of CCEs used for PDCCH transmission is called a CCE aggregation level (L).
  • the CCE aggregation level is a CCE unit for searching for a PDCCH.
  • the size of the CCE aggregation level is defined by the number of adjacent CCEs.
  • the CCE aggregation level may be defined as CCEs equal to the number of any one of ⁇ 1, 2, 4, 8 ⁇ .
  • the following table shows an example of the format of the PDCCH according to the CCE aggregation level, and the number of bits of the PDCCH available.
  • DCI downlink control information
  • UL grant uplink grant
  • DL grant downlink grant
  • RACH response random access response
  • the DCI may be transmitted in a certain format, and usage may be determined according to each DCI format.
  • usage may be determined according to each DCI format.
  • the use of the DCI format can be divided as shown in the following table.
  • the PDCCH may be generated through the following process.
  • the base station adds a cyclic redundancy check (CRC) for error detection to the DCI to be sent to the terminal.
  • CRC cyclic redundancy check
  • the CRC is masked with an identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • RNTI Radio Network Temporary Identifier
  • a paging identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • P-RNTI P-RNTI
  • SI-RNTI System Information-RNTI
  • RA-RNTI random access-RNTI
  • coded data is generated by performing channel coding on the control information added with the CRC. Then, rate matching is performed according to the CCE aggregation level allocated to the PDCCH format. Thereafter, the coded data is modulated to generate modulation symbols.
  • the number of modulation symbols constituting one CCE may vary depending on the CCE aggregation level (one of 1, 2, 4, and 8). Modulation symbols are mapped to physical resource elements (CCE to RE mapping).
  • the UE uses blind decoding to detect the PDCCH.
  • Blind decoding demasks the desired identifier in the cyclic redundancy check (CRC) of the received PDCCH (called candidatetae PDCCH) and checks the CRC error to determine whether the corresponding PDCCH is its control channel. That's the way it is.
  • CRC cyclic redundancy check
  • the reason for performing blind decoding is that the UE does not know in advance which CCE aggregation level or DCI format is transmitted at which position in the control region.
  • a plurality of PDCCHs may be transmitted in one subframe, and the UE monitors the plurality of PDCCHs in every subframe.
  • monitoring means that the UE attempts to decode the PDCCH according to the PDCCH format.
  • a search space is used to reduce the burden of blind decoding.
  • the search space may be referred to as a monitoring set of the CCE for the PDCCH.
  • the UE monitors the PDCCH in the corresponding search space.
  • the search space is divided into a common search space (CSS) and a UE-specific search space (USS).
  • the common search space is a space for searching for a PDCCH having common control information.
  • the common search space may be configured with 16 CCEs up to CCE indexes 0 to 15 and supports a PDCCH having a CCE aggregation level of ⁇ 4, 8 ⁇ . .
  • PDCCHs (DCI formats 0 and 1A) carrying UE specific information may also be transmitted in the common search space.
  • the UE-specific search space supports a PDCCH having a CCE aggregation level of ⁇ 1, 2, 4, 8 ⁇ .
  • the starting point of the search space is defined differently from the common search space and the terminal specific search space.
  • the starting point of the common search space is fixed regardless of the subframe, but the starting point of the UE-specific search space is for each subframe according to the terminal identifier (eg, C-RNTI), the CCE aggregation level, and / or the slot number in the radio frame Can vary.
  • the terminal identifier eg, C-RNTI
  • the CCE aggregation level e.g, C-RNTI
  • / or the slot number in the radio frame Can vary.
  • the search space S (L) k may be defined as a set of candidate PDCCHs.
  • the CCE corresponding to the candidate PDCCH m in the search space S (L) k is given as follows.
  • N CCE, k can be used for transmission of the PDCCH in the control region of subframe k.
  • the control region includes a set of CCEs numbered from 0 to N CCE, k ⁇ 1.
  • M (L) is the number of candidate PDCCHs at CCE aggregation level L in a given search space.
  • the variable Y k is defined as follows.
  • n s is a slot number in a radio frame.
  • the following table shows the number of candidate PDCCHs in the search space.
  • downlink transmission mode transmission mode
  • transmission mode transmission mode
  • the number of codewords or transport blocks included in the PDSCH in each subframe may vary.
  • Transmission mode 1 Non-coding mode (single antenna port transmission mode),
  • Transmission Mode 2 Transmission mode (transmit diversity) that can be used for two or four antenna ports using space-frequency block coding (SFBC).
  • SFBC space-frequency block coding
  • Transmission mode 3 Open loop mode (open loop spatial multiplexing) with rank adaptation based on rank indication (RI) feedback. If the rank is 1, transmit diversity may be applied, and if the rank is greater than 1, a large delay cyclic delay diversity (CDD) may be used.
  • RI rank indication
  • CDD large delay cyclic delay diversity
  • Transmission mode 4 This is a mode in which precoding feedback that supports dynamic rank adaptation is applied (perforated spatial multiplexing).
  • Transmission mode 5 multi-user MIMO
  • Transmission mode 6 closed-loop rank 1 precoding
  • Transmission mode 7 A transmission mode in which a UE-specific reference signal is used.
  • Transmission mode 8 Dual layer transmission using antenna ports 7 and 8, or single antenna port transmission using antenna port 7 or antenna port 8 (dual layer transmission).
  • Transmission mode 9 Up to 8 layers of transmission using antenna ports 7-14.
  • FIG. 6 shows a structure of an uplink subframe.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • a physical uplink control channel (PUCCH) for transmitting uplink control information is allocated to the control region.
  • the data area is allocated a PUSCH (Physical Uplink Shared Channel) for transmitting data (in some cases, control information may also be transmitted).
  • the UE may simultaneously transmit the PUCCH and the PUSCH, or may transmit only one of the PUCCH and the PUSCH.
  • PUCCH for one UE is allocated to an RB pair in a subframe.
  • Resource blocks belonging to a resource block pair occupy different subcarriers in each of a first slot and a second slot.
  • the frequency occupied by RBs belonging to the RB pair allocated to the PUCCH is changed based on a slot boundary. This is called that the RB pair allocated to the PUCCH is frequency-hopped at the slot boundary.
  • HARQ Hybrid Automatic Repeat reQuest
  • ACK Non-acknowledgement
  • NACK Non-acknowledgement
  • channel status information indicating the downlink channel status, for example, Channel Quality Indicator (CQI), precoding matrix on the PUCCH
  • CQI Channel Quality Indicator
  • An index PTI
  • a precoding type indicator PTI
  • RI rank indication
  • the uplink data transmitted on the PUSCH may be a transport block which is a data block for the UL-SCH transmitted during the TTI.
  • the transport block may include user data.
  • the uplink data may be multiplexed data.
  • the multiplexed data may be multiplexed of a transport block and channel state information for an uplink shared channel (UL-SCH).
  • channel state information multiplexed with data may include CQI, PMI, RI, and the like.
  • the uplink data may consist of channel state information only. Periodic or aperiodic channel state information may be transmitted through the PUSCH.
  • PUCCH carries various kinds of control information according to a format.
  • PUCCH format 1 carries a scheduling request (SR). In this case, an OOK (On-Off Keying) method may be applied.
  • PUCCH format 1a carries ACK / NACK (Acknowledgement / Non-Acknowledgement) modulated by a Binary Phase Shift Keying (BPSK) scheme for one codeword.
  • PUCCH format 1b carries ACK / NACK modulated by Quadrature Phase Shift Keying (QPSK) for two codewords.
  • PUCCH format 2 carries a channel quality indicator (CQI) modulated in a QPSK scheme.
  • PUCCH formats 2a and 2b carry CQI and ACK / NACK.
  • PUCCH format 3 is modulated in a QPSK scheme and can carry a plurality of ACK / NACK and SR.
  • Table 6 shows a modulation scheme according to a PUCCH format and the number of bits in a subframe.
  • All PUCCH formats use a cyclic shift (CS) of the sequence in each OFDM symbol.
  • the cyclically shifted sequence is generated by cyclic shifting the base sequence by a specific cyclic shift amount.
  • the specific CS amount is indicated by the cyclic shift index (CS index).
  • n is the element index
  • N is the length of the base sequence.
  • b (n) is defined in section 5.5 of 3GPP TS 36.211 V8.7.0.
  • the length of the sequence is equal to the number of elements included in the sequence. u may be determined by a cell identifier (ID), a slot number in a radio frame, or the like.
  • ID cell identifier
  • the length N of the base sequence is 12 since one resource block includes 12 subcarriers. Different base sequences define different base sequences.
  • the cyclically shifted sequence r (n, I cs ) may be generated by cyclically shifting the base sequence r (n) as shown in Equation 4.
  • I cs is a cyclic shift index indicating the CS amount (0 ⁇ I cs ⁇ N-1).
  • the available cyclic shift index of the base sequence refers to a cyclic shift index derived from the base sequence according to the CS interval. For example, if the length of the base sequence is 12 and the CS interval is 1, the total number of available cyclic shift indices of the base sequence is 12. Alternatively, if the length of the base sequence is 12 and the CS interval is 2, the total number of available cyclic shift indices of the base sequence is six.
  • One slot includes seven OFDM symbols, three OFDM symbols become RS (Reference Signal) symbols for reference signals, and four OFDM symbols become data symbols for ACK / NACK signals.
  • RS Reference Signal
  • modulation symbol d (0) is generated by modulating an encoded 2-bit ACK / NACK signal with Quadrature Phase Shift Keying (QPSK).
  • QPSK Quadrature Phase Shift Keying
  • the cyclic shift index I cs may vary depending on the slot number n s in the radio frame and / or the symbol index l in the slot.
  • the modulation symbol d (0) is spread to the cyclically shifted sequence r (n, I cs ).
  • r n, I cs .
  • the one-dimensional spread sequence may be spread using an orthogonal sequence.
  • An orthogonal sequence w i (k) (i is a sequence index, 0 ⁇ k ⁇ K ⁇ 1) having a spreading factor K 4 uses the following sequence.
  • Different spreading coefficients may be used for each slot.
  • the two-dimensional spreading sequence ⁇ s (0), s (1), s (2), s (3) ⁇ can be expressed as follows.
  • Two-dimensional spread sequences ⁇ s (0), s (1), s (2), s (3) ⁇ are transmitted in the corresponding OFDM symbol after IFFT is performed.
  • the ACK / NACK signal is transmitted on the PUCCH.
  • the reference signal of the PUCCH format 1b is also transmitted by cyclically shifting the base sequence r (n) and spreading it in an orthogonal sequence.
  • the cyclic shift indexes corresponding to the three RS symbols are I cs4 , I cs5 , and I cs6 , three cyclically shifted sequences r (n, I cs4 ), r (n, I cs5 ), r (n, I cs6 ).
  • the orthogonal sequence index i, the cyclic shift index I cs, and the resource block index m are parameters necessary for configuring the PUCCH and resources used to distinguish the PUCCH (or terminal). If the number of available cyclic shifts is 12 and the number of available orthogonal sequence indexes is 3, PUCCHs for a total of 36 terminals may be multiplexed into one resource block.
  • n (1) PUCCH a resource index n (1) PUCCH is defined so that the UE acquires the three parameters for configuring the PUCCH .
  • n (1) PUCCH may also be referred to as PUCCH index.
  • Resource index n (1) PUCCH n CCE + N (1) It can be given as PUCCH , where n CCE is the downlink resource allocation used for reception of downlink data corresponding to the corresponding PDCCH (ie, ACK / NACK signal) PDCCH) is the number of the first CCE used for transmission, N (1) PUCCH is a parameter that the base station informs the UE in a higher layer message.
  • the time, frequency, and code resources used for transmitting the ACK / NACK signal are called ACK / NACK resources or PUCCH resources.
  • the ACK / NACK resource or PUCCH resource necessary for transmitting the ACK / NACK signal on the PUCCH is represented by orthogonal sequence index i, cyclic shift index I cs , resource block index m, or the three indexes. It can be expressed as a PUCCH index n (1) PUCCH to obtain.
  • Channel selection is also referred to as ACK / NACK multiplexing.
  • the terminal selects one PUCCH resource among a plurality of PUCCH resources and transmits ACK / NACK.
  • ACK / NACK is transmitted using PUCCH format 1a / 1b through the selected PUCCH resource, it is called channel selection using PUCCH format 1a / 1b.
  • the UE acquires three PUCCH resources (n (1) PUCCH, 0 , n (1) PUCCH, 1 , n (1) PUCCH, 2 ). Can be.
  • the existing PUCCH format 1b may transmit only 2-bit ACK / NACK. However, channel selection may indicate more ACK / NACK states by linking the allocated PUCCH resources with the actual ACK / NACK signal.
  • an ACK / NACK mismatch between the base station and the UE may occur due to a missing DL subframe (or PDCCH).
  • the UE may not receive the second transport block at all because the PDCCH is lost in the second DL subframe, and may receive only the remaining first and third transport blocks. In this case, if bundling is used, an error occurs in which the terminal transmits an ACK.
  • DAI Downlink Assignment Index
  • the DAI indicates the cumulative number of PDCCHs with assigned PDSCH transmissions.
  • SPS scheduling semi-persistent scheduling
  • a base station may inform a user equipment through semi-persistent transmission / reception in subframes through a higher layer signal such as radio resource control (RRC).
  • RRC radio resource control
  • the parameter given as the higher layer signal may be, for example, a period and an offset value of the subframe.
  • the UE After recognizing the semi-static transmission through the RRC signaling, the UE performs or releases the SPS PDSCH reception or the SPS PUSCH transmission upon receiving an activation and release signal of the SPS transmission through the PDCCH. That is, even if the terminal receives the SPS scheduling through RRC signaling, instead of performing the SPS transmission / reception immediately, but receiving the activation or release signal through the PDCCH, the frequency resource (resource block) according to the resource block allocation specified in the PDCCH, MCS information SPS transmission / reception is performed in a subframe corresponding to a subframe period and an offset value allocated through RRC signaling by applying a modulation and a coding rate according to FIG.
  • the SPS transmission and reception is stopped.
  • the suspended SPS transmission and reception is resumed using a frequency resource designated by the PDCCH, a modulation and coding scheme (MCS), and the like, when the PDCCH including the SPS activation signal is received again.
  • MCS modulation and coding scheme
  • the PDCCH for SPS setting / release may be called SPS allocation PDCCH, and the PDCCH for general PUSCH may be called dynamic PDCCH.
  • the UE may authenticate whether the PDCCH is an SPS allocated PDCCH when all of the following conditions are satisfied. 1. CRC parity bits obtained from the PDCCH payload are scrambled with the SPS C-RNTI, and 2. The value of the new data indicator field should be '0'.
  • the UE receives the DCI information of the corresponding PDCCH as SPS activation or release.
  • Table 9 shows an example of a field value of the SPS allocation PDCCH for authenticating the SPS activation.
  • Table 10 shows an example of a field value of the SPS release PDCCH for authenticating the SPS release.
  • FIG. 8 is a comparative example of a conventional single carrier system and a carrier aggregation system.
  • CC component carrier
  • the carrier aggregation system may be divided into a continuous carrier aggregation system in which aggregated carriers are continuous and a non-contiguous carrier aggregation system in which carriers aggregated are separated from each other.
  • a carrier aggregation system simply referred to as a carrier aggregation system, it should be understood to include both the case where the component carrier is continuous and the case where it is discontinuous.
  • the target carrier may use the bandwidth used by the existing system as it is for backward compatibility with the existing system.
  • the 3GPP LTE system supports bandwidths of 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz, and the 3GPP LTE-A system may configure a bandwidth of 20 MHz or more using only the bandwidth of the 3GPP LTE system.
  • broadband can be configured by defining new bandwidth without using the bandwidth of the existing system.
  • the system frequency band of a wireless communication system is divided into a plurality of carrier frequencies.
  • the carrier frequency means a center frequency of a cell.
  • a cell may mean a downlink frequency resource and an uplink frequency resource.
  • the cell may mean a combination of a downlink frequency resource and an optional uplink frequency resource.
  • CA carrier aggregation
  • the terminal In order to transmit and receive packet data through a specific cell, the terminal must first complete configuration for the specific cell.
  • the configuration refers to a state in which reception of system information necessary for data transmission and reception for a corresponding cell is completed.
  • the configuration may include an overall process of receiving common physical layer parameters required for data transmission and reception, media access control (MAC) layer parameters, or parameters required for a specific operation in the RRC layer.
  • MAC media access control
  • the cell in the configuration complete state may exist in an activation or deactivation state.
  • activation means that data is transmitted or received or is in a ready state.
  • the UE may monitor or receive a control channel (PDCCH) and a data channel (PDSCH) of an activated cell in order to identify resources (which may be frequency, time, etc.) allocated thereto.
  • PDCCH control channel
  • PDSCH data channel
  • Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.
  • the terminal may receive system information (SI) required for packet reception from the deactivated cell.
  • SI system information
  • the terminal does not monitor or receive the control channel (PDCCH) and data channel (PDSCH) of the deactivated cell in order to check the resources (may be frequency, time, etc.) allocated to them.
  • PDCH control channel
  • PDSCH data channel
  • the cell may be divided into a primary cell, a secondary cell, and a serving cell.
  • the primary cell refers to a cell operating at a primary frequency, and is a cell in which the terminal performs an initial connection establishment procedure or connection reestablishment with the base station, or is indicated as a primary cell in a handover process. It means a cell.
  • the secondary cell refers to a cell operating at the secondary frequency, and is established and used to provide additional radio resources once the RRC connection is established.
  • the serving cell is configured as a primary cell when the carrier aggregation is not set or the terminal cannot provide carrier aggregation.
  • the term serving cell indicates a cell configured for the terminal and may be configured in plural.
  • One serving cell may be configured with one downlink component carrier or a pair of ⁇ downlink component carrier, uplink component carrier ⁇ .
  • the plurality of serving cells may be configured as a set consisting of one or a plurality of primary cells and all secondary cells.
  • a primary component carrier refers to a component carrier (CC) corresponding to a primary cell.
  • the PCC is a CC in which the terminal initially makes a connection (connection or RRC connection) with the base station among several CCs.
  • the PCC is a special CC that manages a connection (Connection or RRC Connection) for signaling regarding a plurality of CCs and manages UE context, which is connection information related to a terminal.
  • the PCC is connected to the terminal and always exists in the active state in the RRC connected mode.
  • the downlink component carrier corresponding to the primary cell is called a downlink primary component carrier (DL PCC), and the uplink component carrier corresponding to the primary cell is called an uplink major carrier (UL PCC).
  • DL PCC downlink primary component carrier
  • U PCC uplink major carrier
  • Secondary component carrier refers to a CC corresponding to the secondary cell. That is, the SCC is a CC allocated to the terminal other than the PCC, and the SCC is an extended carrier for the additional resource allocation other than the PCC and may be divided into an activated or deactivated state.
  • the downlink component carrier corresponding to the secondary cell is referred to as a DL secondary CC (DL SCC), and the uplink component carrier corresponding to the secondary cell is referred to as an uplink secondary component carrier (UL SCC).
  • DL SCC DL secondary CC
  • UL SCC uplink secondary component carrier
  • the primary cell and the secondary cell have the following characteristics.
  • the primary cell is used for transmission of the PUCCH.
  • the primary cell is always activated, while the secondary cell is a carrier that is activated / deactivated according to specific conditions.
  • RLF Radio Link Failure
  • the primary cell may be changed by a security key change or a handover procedure accompanying a RACH (Random Access CHannel) procedure.
  • NAS non-access stratum
  • the primary cell is always configured with a pair of DL PCC and UL PCC.
  • a different CC may be configured as a primary cell for each UE.
  • the primary cell can be replaced only through a handover, cell selection / cell reselection process.
  • RRC signaling may be used to transmit system information of a dedicated secondary cell.
  • the downlink component carrier may configure one serving cell, and the downlink component carrier and the uplink component carrier may be connected to configure one serving cell.
  • the serving cell is not configured with only one uplink component carrier.
  • the activation / deactivation of the component carrier is equivalent to the concept of activation / deactivation of the serving cell.
  • activation of serving cell 1 means activation of DL CC1.
  • serving cell 2 assumes that DL CC2 and UL CC2 are connected and configured, activation of serving cell 2 means activation of DL CC2 and UL CC2.
  • each component carrier may correspond to a serving cell.
  • the number of component carriers aggregated between the downlink and the uplink may be set differently.
  • the case where the number of downlink CCs and the number of uplink CCs are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.
  • the size (ie bandwidth) of the CCs may be different. For example, assuming that 5 CCs are used for a 70 MHz band configuration, 5 MHz CC (carrier # 0) + 20 MHz CC (carrier # 1) + 20 MHz CC (carrier # 2) + 20 MHz CC (carrier # 3) It may be configured as + 5MHz CC (carrier # 4).
  • a plurality of component carriers (CCs), that is, a plurality of serving cells may be supported.
  • Such a carrier aggregation system may support cross-carrier scheduling.
  • Cross-carrier scheduling is a resource allocation of a PDSCH transmitted on another component carrier through a PDCCH transmitted on a specific component carrier and / or other components other than the component carrier basically linked with the specific component carrier.
  • a scheduling method for resource allocation of a PUSCH transmitted through a carrier That is, the PDCCH and the PDSCH may be transmitted through different downlink CCs, and the PUSCH may be transmitted through another uplink CC other than the uplink CC linked with the downlink CC through which the PDCCH including the UL grant is transmitted. .
  • a carrier indicator indicating a DL CC / UL CC through which a PDSCH / PUSCH for which PDCCH provides control information is transmitted is required.
  • a field including such a carrier indicator is hereinafter called a carrier indication field (CIF).
  • a carrier aggregation system supporting cross carrier scheduling may include a carrier indication field (CIF) in a conventional downlink control information (DCI) format.
  • CIF carrier indication field
  • DCI downlink control information
  • 3 bits may be extended, and the PDCCH structure may include an existing coding method, Resource allocation methods (ie, CCE-based resource mapping) can be reused.
  • FIG. 9 illustrates a subframe structure for cross carrier scheduling in a carrier aggregation system.
  • the base station may set a PDCCH monitoring DL CC set.
  • the PDCCH monitoring DL CC set includes some DL CCs among the aggregated DL CCs, and when cross-carrier scheduling is configured, the UE performs PDCCH monitoring / decoding only for DL CCs included in the PDCCH monitoring DL CC set. In other words, the base station transmits the PDCCH for the PDSCH / PUSCH to be scheduled only through the DL CC included in the PDCCH monitoring DL CC set.
  • the PDCCH monitoring DL CC set may be configured UE-specifically, UE group-specifically, or cell-specifically.
  • three DL CCs (DL CC A, DL CC B, and DL CC C) are aggregated, and DL CC A is set to PDCCH monitoring DL CC.
  • the UE may receive the DL grant for the PDSCH of the DL CC A, the DL CC B, and the DL CC C through the PDCCH of the DL CC A.
  • the DCI transmitted through the PDCCH of the DL CC A may include the CIF to indicate which DCI the DLI is.
  • an FDD frame (type 1) and a TDD frame (type 2) exist.
  • a plurality of serving cells may be allocated to one terminal and transmitted / received through a plurality of serving cells, but the terminal may use only the same type of frame in the plurality of serving cells. In other words, only serving cells using the same type of frame may be allocated to the same terminal.
  • aggregation between serving cells using different types of frames is also considered due to the need for aggregation of various idle frequency bands. Under this premise, a scheduling method is required in a carrier aggregation system.
  • FIG. 10 illustrates a scheduling method between a base station and a terminal according to an embodiment of the present invention.
  • the base station transmits the UL-DL configuration of the secondary cells through the RRC message of the primary cell (S110). This assumes that the base station additionally aggregates the secondary cell while the terminal is connected to the primary cell. If the base station aggregates additional secondary cells in a state in which primary and secondary cells are aggregated, an RRC message for UL-DL configuration of the additional secondary cell may be transmitted in the aggregated cells.
  • the primary cell may be a serving cell using an FDD frame
  • the secondary cells may be at least one serving cells using a TDD frame.
  • all cells may be configured as TDD, and at this time, the UL-DL configuration of the primary cell and the secondary cell may be different.
  • the UL-DL configuration of the RRC message is used in each subframe within one TDD frame, which is one of a downlink subframe (D), an uplink subframe (U), and a special subframe (S). Setting information indicating whether a subframe is of a kind.
  • the UL-DL configuration of the RRC message may be given for each secondary cell, for each secondary cell group, or for all secondary cells allocated to the terminal. That is, the UL-DL configuration of the RRC message may be set differently for each secondary cell or may be set identically for at least two secondary cells.
  • the UL-DL configuration of the RRC message may be the same information as the UL-DL configuration broadcast as system information in each secondary cell.
  • the UL-DL configuration broadcasted in each secondary cell is called a cell-specific UL-DL configuration, and the UL-DL configuration included in the RRC message may be the same as the cell-specific UL-DL configuration.
  • UL-DL configuration for each subframe may be configured through an RRC message transmitted through the primary cell.
  • Receiving is more efficient than receiving cell specific UL-DL configuration through the secondary cell. If the cell-specific UL-DL configuration must be received through the secondary cell, it is necessary to continuously monitor the system information of the secondary cell.
  • the base station transmits information indicating a cell-specific UL-DL configuration change of the secondary cell through the primary cell (S120).
  • the information indicating the change of the cell-specific UL-DL configuration of the secondary cell may be the UE-specific UL-DL configuration.
  • the UE-specific UL-DL configuration means a UL-DL configuration in a TDD frame applied only to a specific UE.
  • the UE-specific UL-DL configuration for the serving cell that needs to receive system information from another serving cell is preferably transmitted along with the cell-specific UL-DL configuration.
  • the UE-specific UL-DL configuration may be commonly applied to all serving cells allocated to the UE.
  • the UE performs 'UDSX' configuration for each subframe of the secondary cells based on the cell-specific UL-DL configuration and the information indicating the cell-specific UL-DL configuration change (S130).
  • the UDSX configuration means setting up each subframe of the secondary cells as an uplink subframe (U), a downlink subframe (D), a special subframe (S), and an unused subframe (X).
  • the terminal may perform transmission and reception with the base station by performing UDSX configuration of each subframe.
  • 11 shows an example of an unused subframe.
  • a UE may be allocated a first serving cell using an FDD frame, a second serving cell using a TDD frame, and a third serving cell.
  • the first serving cell may be a primary cell
  • the second serving cell and the third serving cell may be secondary cells.
  • subframe #N of the second serving cell is set to U and the subframe of the third serving cell.
  • #N may be set to D.
  • subframe #N becomes an unused subframe 801.
  • the UE may not use the unused subframe, and the state of the unused subframe that is not used is expressed as X to distinguish it from the existing D, U, and S.
  • an unused subframe occurs due to different cell-specific UL-DL configurations of different serving cells, but an unused subframe includes a cell-specific UL-DL configuration configured for one serving cell. This may occur even when UE-specific UL-DL configurations for the one serving cell are different. That is, an unused subframe may occur in which a transmission direction according to a cell-specific UL-DL configuration and a transmission direction according to a UE-specific UL-DL configuration do not coincide with respect to a specific subframe of the secondary cell.
  • UL-DL configuration of secondary cells using a TDD frame may be indicated through UL-DL configuration (for example, UL-DL configuration as shown in Table 2) of a subframe set unit in one frame as described above. It may be set in units of subframes.
  • UL-DL configuration of secondary cells using a TDD frame may be indicated through UL-DL configuration (for example, UL-DL configuration as shown in Table 2) of a subframe set unit in one frame as described above. It may be set in units of subframes.
  • FIG. 12 shows an example of performing UL-DL configuration of a secondary cell on a subframe basis.
  • a primary cell and a secondary cell may be allocated to a terminal.
  • the primary cell may use an FDD frame and the secondary cell may use a TDD frame.
  • the primary cell may be selected from the licensed band of the existing wireless communication system in terms of frequency band, and the secondary cell may use an unlicensed band.
  • Each subframe of the secondary cell may be a floating subframe in which which subframe of the UDSX is not determined.
  • the base station may transmit a PDCCH (called UE specific L1 signaling) to the UE through any subframe 901 of the primary cell.
  • UE-specific L1 signaling the UE may configure the UDSX configuration of the fluid subframe 902 according to whether the DCI format detected through the PDCCH connected to the fluid subframe 902 schedules uplink or downlink. You can judge.
  • the flexible subframe 902 is used as an uplink subframe.
  • the DCI format is a PUSCH transmission by a UL grant or PHICH NACK response that causes the use of an uplink subframe
  • the flexible subframe 902 is used as an uplink subframe.
  • the DCI format is a DL grant that causes the use of a downlink subframe
  • the flexible subframe and its associated UL grant timing and DL grant timing may be set independently of each other.
  • FIG. 12 illustrates a case where a control channel including a grant exists in a primary cell and a data channel exists in a secondary cell. That is, the case in which the control channel and the data channel exist in different frequency bands or serving cells. However, this is not a limitation and may be applied to a case where a flexible subframe and a UL grant / DL grant associated with it exist in the same serving cell.
  • the subframe of the secondary cell to which is applied may be subframe # n + k. That is, the subframe (in the primary cell) receiving the information indicating the UDSX setting by giving the offset value k may be different from the subframe (in the secondary cell) to which the information is applied.
  • This offset value can facilitate the UL / DL conversion of the subframe of the secondary cell.
  • the k value may be a fixed value or a signaled value. In addition, it may be commonly applied to D, U, and S, or may be differently applied according to D, U, and S.
  • the present invention is not limited to the case where all subframes of the secondary cell are flexible subframes. That is, some subframes of the secondary cell may be designated as a D (or U) subframe by default. For example, in FIG. 11, some subframes of the secondary cell are designated as D subframes by default and may be used for downlink measurement. In addition, some subframes of the secondary cell are designated as U subframes by default and may be used for transmitting a sounding reference signal (SRS).
  • SRS sounding reference signal
  • the floating subframe is designated as D (or U) by default, and the UDSX configuration may be changed through the primary cell.
  • the UE may recognize that the subframe is set to D as a default value, and when the UE receives the specific signaling, the UE may recognize the subframe as the U subframe.
  • the subframe which is the default value D, may be changed to U only for the N subframe periods, and may be set to return to the default value D again when the N subframe periods pass.
  • the N value may be fixed in advance or signaled by RRC.
  • a primary cell uses an FDD frame, but this is not a limitation. That is, the primary cell may use a TDD frame in which the UL-DL configuration is fixed semi-statically. In this case, it may be necessary to set a new timing relationship for the control signal transmission. The timing relationship can be promised or signaled in RRC.
  • the entire subframe of the primary cell may not maintain backward compatibility or maintain backward compatibility only in some subframes so that the subframe of the primary cell may be fluidly set. The present invention can also be applied in this case.
  • the number of codewords that can be transmitted in the subframe (default subframe) in which D or U is set as the default and the flexible subframe may be set differently.
  • the uplink subframe and the downlink subframe are always 1: 1 at the same time in one frame.
  • the ratio of the uplink subframe and the downlink subframe varies depending on the UL-DL configuration.
  • the conventional TDD scheme takes time for UL-DL configuration and UL-DL reconfiguration, and there is a problem in that a termination or wait is required when there is an HARQ process that has been previously performed. Therefore, there is a limit to adaptive operation when the traffic ratio of uplink and downlink changes rapidly. Accordingly, a method of dynamically setting a UL-DL configuration of a subframe in a TDD frame is considered, and a method of dynamically configuring a UL-DL configuration of a TDD frame used in a secondary cell has been described with reference to FIG. 12.
  • a downlink grant / uplink grant for scheduling a PDSCH / PUSCH resource is required.
  • PHICH and PUCCH are required to transmit ACK / NACK, which is a response indicating whether the PDSCH / PUSCH has been successfully received.
  • the DL / UL grant and PHICH are transmitted through the downlink subframe at the promised time, and the PUCCH is transmitted in the UL subframe, so a DL / UL subframe capable of transmitting the DLSCH should be promised.
  • the base station transmitting the PHSCH performs PUSCH scheduling, and thus it is possible to know whether the PUSCH is scheduled and the number thereof. Therefore, the ICH / NACK payload for the actually scheduled PUSCH may be configured to transmit the PHICH.
  • the UL ACK / NACK response to the PDSCH may be inconsistent between whether the PDSCH scheduling and the number between the base station that scheduled the PDSCH and the terminal transmitting the UL ACK / NACK. For example, there may be a case where the UE does not receive the PDCCH scheduling the PDSCH at all.
  • This problem may occur in a wireless communication system that can flexibly configure the UL-DL configuration of the secondary cell, for example, the wireless communication system described with reference to FIG. 12, and thus, a method of transmitting ACK / NACK is a problem.
  • FIG 13 shows an ACK / NACK transmission method according to an embodiment of the present invention.
  • the base station transmits information indicating the UL-DL configuration for secondary cells to the terminal (S210).
  • the information indicating the UL-DL configuration may be, for example, UL-DL configuration information for each TDD frame of an explicit secondary cell, or may be implicitly informed for each subframe through the DCI format included in the PDCCH.
  • Information indicating the UL-DL configuration may be transmitted through the primary cell.
  • the information indicating the UL-DL configuration may inform the UL-DL configuration for the subframe #N of the secondary cells.
  • the base station transmits data through at least one secondary cell (S220). At this time, of course, the base station can also transmit data through the primary cell. Using the above example, the base station transmits at least one PDSCH in subframe #N of the primary cell and the secondary cells.
  • the terminal configures an ACK / NACK payload for the received data (S230).
  • S230 A method of configuring the ACK / NACK payload by the UE will be described later in detail.
  • the ACK / NACK payload size indicates the information bit size of the ACK / NACK.
  • the terminal feeds back the configured ACK / NACK payload to the base station (S240).
  • the subframe in which the UE transmits the ACK / NACK payload may be subframe #M of the primary cell.
  • the subframe #M may be a subframe spaced by a predetermined offset value (for example, 4) with respect to the subframe #N or a subframe indicated by the base station.
  • Subframe #M is an UL subframe.
  • the UE may configure the ACK / NACK payload in the UL subframe using any one of the following methods.
  • the UE performs ACK / NACK payload according to the number of default DL subframes, the number of flexible subframes, and the transmission mode of each serving cell, corresponding to the UL subframe of the primary cell designated to transmit ACK / NACK.
  • the default DL subframe means a subframe set fixedly or semi-statically as a DL subframe.
  • a subframe that is semi-statically set as a DL subframe in the secondary cell is a default DL subframe.
  • the flexible subframe refers to a subframe that can be dynamically configured as a UL subframe or a DL subframe.
  • a subframe of a secondary cell scheduled by the PDCCH is determined as a UL subframe or a DL subframe by a PDCCH transmitted in a primary cell whether a UL grant or a DL grant is included.
  • Subframes are flexible subframes.
  • the UE determines the ACK / NACK payload size assuming that all of the subframes of the serving cells corresponding to the UL subframe are DL subframes regardless of whether they are DL subframes or UL subframes. Since the UE may not receive the DL grant or the UL grant scheduling the flexible subframe, it is assumed that all the flexible subframes are DL subframes and determine the ACK / NACK payload size.
  • the base station transmits a DL grant on a PDCCH scheduling a flexible subframe, but may be incorrectly recognized as a UL grant due to a decoding error of the UE.
  • the DL subframe is always a DL subframe.
  • the UE receives the UL grant for the flexible subframe and always assumes the DL subframe and determines the ACK / NACK payload size even if the flexible subframe is recognized as the UL subframe.
  • the UE determines the ACK / NACK payload size in consideration of the number of default DL subframes and flexible subframes and the transmission mode of the serving cell including the subframes. If the transmission mode of the serving cell can transmit up to N codewords in one DL subframe, N X (default DL subframe + fluid subframe) becomes the ACK / NACK payload size.
  • N_default X default DL subframe + (N_flow X fluid DL subframe) is ACK / NACK payload size.
  • N_default is the number of codewords that can be transmitted in the default DL subframe
  • N_flow is the number of codewords that can be transmitted in the floating DL subframe.
  • the ACK / NACK payload size does not change, and thus, it is robust to reception error.
  • four serving cells may be allocated to a terminal. That is, the first serving cell, the second serving cell, the third serving cell, and the fourth serving cell may be allocated to the terminal.
  • the first serving cell is a primary cell and the second to fourth serving cells are secondary cells.
  • the primary cell uses an FDD frame and the secondary cells use a TDD frame.
  • subframe #N of the second to fourth serving cells are linked to UL subframe # N + 4 of the primary cell.
  • subframe #N of the second serving cell is a default DL subframe
  • the UE recognizes subframe #N of the third serving cell as a flexible UL subframe
  • subframe #N of the fourth serving cell is flexible. Assume that it is recognized as a DL subframe.
  • the UE includes both the DL subframe #N of the first serving cell and the subframes #N of the second to fourth serving cells in UL subframe # N + 4 of the first serving cell.
  • the ACK / NACK payload size is determined in consideration of the transmission mode of each serving cell. In a transmission mode in which two codewords are transmitted in one subframe (PDSCH), a 2-bit ACK / NACK payload is required for each subframe.
  • this method differs from the subframes recognized as UL subframes among the floating subframes of the respective serving cells linked to the UL subframes of the primary cell transmitting the ACK / NACK ACK / NACK payload.
  • the UE configures an ACK / NACK payload for a default DL subframe of each serving cell and a subframe not recognized as a UL subframe among the flexible subframes (or a subframe recognized as a DL subframe).
  • the ACK / NACK payload size is determined in consideration of the transmission mode of each serving cell.
  • the ACK / NACK payload size is the number of subframes (or DL subframes recognized as DL subframes) that are not recognized as UL subframes by the UE among the floating subframes connected to the UL subframes transmitting the ACK / NACK.
  • the number of default downlink subframes equal to the number of bits equal to the product of the maximum transmittable codewords in each subframe.
  • N_default X default DL subframe + (UL sub among N_flow X fluid subframes).
  • Subframe not recognized as a frame becomes the ACK / NACK payload size. This method assumes that the base station can reliably detect that the UE cannot receive the PU grant and thus cannot transmit the PUSCH.
  • the UE performs ACK / DL on DL subframe #N of the first serving cell and subframe #N of the fourth serving cell in UL subframe # N + 4 of the primary cell. Configure only the NACK payload. Since the UE recognizes the subframe #N of the third serving cell as an UL subframe, and the subframe #N of the second serving cell is the default UL subframe, it is excluded when configuring the ACK / NACK payload.
  • This method is a method of configuring only the ACK / NACK payload for the actually scheduled PDSCH when the UE can accurately know the number of PDSCHs actually scheduled through information such as downlink assignment information (DAI). That is, only the ACK / NACK payload for the subframe in which the PDSCH is actually scheduled among the default DL subframes and the floating subframes of each serving cell is configured.
  • DAI downlink assignment information
  • the UE actually receives a PDSCH in DL subframe #N of the first serving cell, subframe #N of the second serving cell, and subframe #N of the third serving cell. Accordingly, only the ACK / NACK payload for the subframe #N of the first to third serving cells is configured. The subframe #N of the fourth serving cell is excluded because the PDSCH has not been received.
  • the terminal may transmit after compressing some or all of the ACK / NACK payload through bundling or ACK counting according to the channel state or control channel configuration. .
  • the PUCCH resource and the PUCCH format in which the ACK / NACK is transmitted may be set differently. That is, i) when receiving a PDCCH scheduling a PDSCH in only one default DL subframe of a specific serving cell or receiving a PDCCH (eg, a DL SPS release PDCCH) requesting an ACK / NACK response and ii. In other cases, the PUCCH resource to which the ACK / NACK is transmitted is different from the PUCCH format.
  • ACK / NACK is performed using a dynamic PUCCH format 1a / 1b corresponding to the first CCE in which the PDCCH is transmitted. NACK may be transmitted. Otherwise, ACK / NACK may be transmitted through an ACK / NACK transmission resource (for example, PUCCH format 3) capable of transmitting ACK / NACK for a plurality of cells and a plurality of subframes that are explicitly allocated.
  • PUCCH format 3 for example, PUCCH format 3
  • the ACK / NACK response for the SPS PDSCH, the PDSCH scheduled for the PDCCH, and the ACK / NACK response for the PDCCH requesting the ACK / NACK response correspond to the first CCE of the PDCCH.
  • a channel selection scheme may be used that selectively uses dynamic PUCCH format 1a / 1b resources and explicit PUCCH format 1a / 1b resources for SPS.
  • ACK / NACK may be specifically transmitted in the following manner.
  • PDSCH the scheduled among primary DL subframes of the plurality of DL subframes corresponding to UL subframes (eg, subframe n) transmitting ACK / NACK (A) without PDCCH (in SPS), is primary Is present in only one cell (PCC) and there is no PDCCH requiring an ACK / NACK response, or
  • an ARI indicating selection of an ACK / NACK transmission resource that is, a PUCCH resource capable of transmitting ACK / NACK for a plurality of cells and a plurality of subframes.
  • the TPC field is recognized as a TPC, and in the case of other PDCCHs, the TPC field is recognized as an ARI.
  • the ACK / NACK resource allocation scheme is similarly applied to a case where only a primary cell is allocated to a terminal without a secondary cell and a default subframe and a floating subframe exist.
  • the explicit PUCCH format 1a / 1b resource may be the same resource as the explicit PUCCH format 1a / 1b resource allocated for the SPS.
  • ACK / NACK may be transmitted using the PUCCH format 3.
  • the TPC field of the PDCCH may be used as an ACK (ACK / NACK resource indicator) for designating one of the resources of the PUCCH format 3 previously set.
  • the first to third embodiments described above may be applied even within one serving cell. For example, if one serving cell using a TDD frame is allocated to the terminal, and the serving cell can dynamically configure UL-DL for each subframe, the first to third embodiments may be applied.
  • FIG 17 illustrates an example in which the first embodiment or the second embodiment is applied when only one serving cell is configured for the terminal.
  • a primary cell may use a TDD frame.
  • ACK / NACK may be transmitted only in the default UL subframe 171. Assume that there are four subframes linked to the default UL subframe 171.
  • the terminal configures the ACK / NACK payload for both the default DL subframe and the fluid subframe.
  • the UE subframes other than the floating subframes recognized as used as the default DL subframe and the actual UL subframe that is, the subframes recognized as DL subframes among the floating subframes.
  • the ACK / NACK payload is sent in the default UL subframe 172.
  • the UE may configure an ACK / NACK payload for a subframe in which an actual PDSCH is scheduled among default DL subframes and flexible subframes.
  • FIGS. 14 to 16 illustrate a case where a plurality of subframes are linked to one UL subframe on the frequency axis
  • FIG. 16 illustrates a case where a plurality of subframes are linked to one UL subframe on the time axis.
  • the method described with reference to FIGS. 14 to 16 and the method described with reference to FIG. 17 may be used in combination.
  • the ACK / NACK payload may be determined in the following order. 1) ACK / NACK is preferentially arranged in the order of the cell ID of the serving cell to which the subframe belongs, and in the same serving cell, ACK / NACK is assigned to the default DL subframe first, followed by ACK / NACK for the fluid subframe. NACK can be arranged. Or 2) ACK / NACK is allocated for the default DL subframe first, and ACK / NACK for the floating subframe.
  • the default DL subframes may be arranged according to cell IDs, and the flexible subframes may be arranged according to cell IDs.
  • ACK / NACK may be arranged in the order of the cell ID of the serving cell to which the subframe belongs, and then the same serving cell may be arranged according to the corresponding order value when the scheduling order is known by the DAI.
  • the same cell since the order value is not known in the case of the SPS PDSCH scheduled without the PDCCH, the same cell may be arranged at a fixed position (latest or front).
  • FIG. 18 shows a configuration of a base station and a terminal according to an embodiment of the present invention.
  • the base station 100 includes a processor 110, a memory 120, and an RF unit 130.
  • the processor 110 implements the proposed functions, processes and / or methods. For example, the processor 110 transmits uplink-downlink (UL-DL) configuration information for each subframe of a time division duplex (TDD) frame used in secondary cells through the primary cell.
  • UL-DL uplink-downlink
  • TDD time division duplex
  • downlink data is transmitted through the primary cell and the secondary cell.
  • an ACK / NACK for the downlink data is received through a primary cell. If the NACK is received, retransmission data can be transmitted.
  • the memory 120 is connected to the processor 110 and stores various information for driving the processor 110.
  • the RF unit 130 is connected to the processor 110 and transmits and / or receives a radio signal.
  • the terminal 200 includes a processor 210, a memory 220, and an RF unit 230.
  • the processor 210 implements the proposed functions, processes and / or methods. For example, the processor 210 receives uplink-downlink (UL-DL) configuration information for the first subframes of the secondary cells via the primary cell, and receives at least one of the primary cell and the secondary cells. Receive data in the first subframe of the serving cell. Thereafter, ACK / NACK is configured for the received data, and the ACK / NACK is transmitted through the second subframe of the primary cell. In this case, the first subframes correspond to the second subframe.
  • UL-DL uplink-downlink
  • the processor 210 determines the payload size of the ACK / NACK, wherein the ACK / NACK payload size is the number of default downlink subframes, the number of flexible subframes, and the first subframes among the first subframes. It is determined based on the transmission mode of each serving cell included.
  • the memory 220 is connected to the processor 210 and stores various information for driving the processor 210.
  • the RF unit 230 is connected to the processor 210 to transmit and / or receive a radio signal.
  • Processors 110 and 210 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, data processing devices, and / or converters for interconverting baseband signals and wireless signals.
  • the memory 120, 220 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium, and / or other storage device.
  • the RF unit 130 and 230 may include one or more antennas for transmitting and / or receiving a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in the memories 120 and 220 and executed by the processors 110 and 210.
  • the memories 120 and 220 may be inside or outside the processors 110 and 210, and may be connected to the processors 110 and 210 by various well-known means.

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Abstract

L'invention concerne un procédé de transmission d'un accusé de réception/non-réception (ACK/NACK) d'un terminal dans un système de communication sans fil, et un terminal utilisant le procédé. Le procédé comprend les étapes consistant à : recevoir des informations de réglages montants-descendants (UL-DL pour Uplink-Downlink) sur une pluralité de sous-trames ; recevoir des données d'au moins une sous-trame parmi la pluralité de sous-trames ; composer l'ACK/NACK sur les données reçues ; et transmettre l'ACK/NACK par l'intermédiaire de la sous-trame montante.
PCT/KR2012/001005 2011-02-10 2012-02-10 Procédé et dispositif de transmission d'une confirmation de réception dans un système de communication sans fil WO2012108720A2 (fr)

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US13/984,752 US9363687B2 (en) 2011-02-10 2012-02-10 Method and device for transmitting reception confirmation in wireless communication system
CN201280008636.XA CN103404063B (zh) 2011-02-10 2012-02-10 在无线通信系统中发射接收确认的方法和装置
KR1020137020912A KR101530800B1 (ko) 2011-02-10 2012-02-10 무선통신 시스템에서 수신확인 전송 방법 및 장치

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US201161441646P 2011-02-10 2011-02-10
US61/441,646 2011-02-10
US201161471703P 2011-04-05 2011-04-05
US61/471,703 2011-04-05
US201161509123P 2011-07-19 2011-07-19
US61/509,123 2011-07-19
US201161538111P 2011-09-22 2011-09-22
US61/538,111 2011-09-22

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CN103404063B (zh) 2016-07-06
KR20130115348A (ko) 2013-10-21
US9363687B2 (en) 2016-06-07
KR101530800B1 (ko) 2015-06-22
US20130322343A1 (en) 2013-12-05
WO2012108720A3 (fr) 2012-12-20

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